Callback to clean up after filtering has been applied
Specified as filter.cleanup, this is an optional callback invoked
after the filter has been applied. If the check, apply, or
stream callbacks allocated a payload to keep per-source filter
state, use this callback to free that payload and release resources
as required.
Callback to clean up after filtering has been applied
Specified as filter.cleanup, this is an optional callback invoked after the filter has been applied. If the check, apply, or stream callbacks allocated a payload to keep per-source filter state, use this callback to free that payload and release resources as required.